nimble/test: Pass SM public key structure to ble_sm_dbg_set_sc_keys
nimble/test: Pass SM public key structure to ble_sm_dbg_set_sc_keys

While this is the same pointer avoid confusion when pasing 32 bytes
buffer (x) to function using 64 buyes (x and y).

X-Original-Commit: c3eaaebdd640ebd48e25acfbc2f10836354b077b

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble